MQTT

🌟 Introduction

In this section, we'll explore the MQTT Blocks, which allow seamless integration with MQTT protocols for IoT (Internet of Things) applications.

---

🧠 What Is MQTT?

MQTT (Message Queuing Telemetry Transport) is a lightweight messaging protocol designed for resource-constrained devices. It allows devices to publish, subscribe, and exchange data efficiently over a network.

• BuddyOS Stem system uses MQTT to communicate with ESP device. So you can show sensor data of your device to mobile app or control device remotely using MQTT.
• Go to home page of BYA website, check your device detail information to get MQTT username and MQTT password.
• Broker: stem.mqtt.buddyos.ai
• Port: 1883
• Topic to listen data: stem/device/{MQTT username}/event, example: stem/device/ESP32-cc8da2ecd26c/event. You can only subscribe to the topic that include your MQTT username.
• Topic to send data to device: stem/device/{MQTT username}/directive, example: stem/device/ESP32-cc8da2ecd26c/directive. You should send data as a JSON String with format:

{
    "action": "your action",
    "data": {}
}

---

🔗 Key MQTT Blocks

1. function handle_mqtt_message

• Purpose: Define actions to take when a message is received on a subscribed topic.

🧭 Tip

This block lets you define how your program reacts to received messages, enabling event-driven workflows.

---

2. MQTT message action

• Purpose: Get the message action inside the handler function.

📝 Note

Use this block to let your program read the message action received

---

3. send MQTT event

• Purpose: send data to MQTT topic stem/device/{serial_number}/event.

📝 Note

Use this block to send data from device to MQTT event topic. Then use another device or platform to listen to event topic. You can create a dashboard for monitor device data realtime.

---

🛠️ Example Workflow

Scenario: Sending analog data to MQTT

• Start getting data from sensor when receiving message action start. Then sending sensor data to MQTT event topic.

---

🌍 Applications

🏠 Smart Home

• Publish temperature, humidity, and light sensor data.
• Subscribe to control topics for automation.

🚗 Vehicle Monitoring

• Track real-time sensor data like speed and fuel levels.

🌐 IoT Projects

• Create a network of devices that exchange data efficiently.

---

🎉 Conclusion

The MQTT Blocks in Blockly empower users to build robust IoT systems with ease. By combining blocks for publishing, subscribing, and handling messages, you can create intelligent, event-driven applications.

---

🚀 Happy IoT Programming!

---